#include<iostream>
using namespace std;
int sum(int start,int end)
{
  int sumnumber=0;
  for(int i=start;i<=end;i++)
  {
    sumnumber+=i;
  }
  return sumnumber;
}
int main()
{
  int start=0;
  int end=100;
 cout<< sum(start,end)<<endl;
  return 0;
}

